<?php
/**
 * This code is licensed under the BSD 3-Clause License.
 *
 * Copyright (c) 2017, Maks Rafalko
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

declare(strict_types=1);

namespace Infection\Testing;

use Infection\Mutator\Mutator;
use Infection\PhpParser\MutatedNode;
use PhpParser\Node;
use PhpParser\NodeVisitorAbstract;
use PhpParser\Token;

/**
 * @internal
 */
final class SimpleMutationsCollectorVisitor extends NodeVisitorAbstract
{
    /**
     * @var SimpleMutation[]
     */
    private $mutations = [];

    /**
     * @param Mutator<Node> $mutator
     */
    public function __construct(
        private readonly Mutator $mutator,
        /**
         * @var Node[]
         */
        private readonly array $fileAst,
        /**
         * @var Token[]
         */
        private readonly array $originalFileTokens,
        private readonly string $originalFileContent,
    ) {
    }

    public function leaveNode(Node $node)
    {
        if (!$this->mutator->canMutate($node)) {
            return null;
        }

        // It is important to not rely on the keys here. It might otherwise result in some elements
        // being overridden, see https://3v4l.org/JLN73
        foreach ($this->mutator->mutate($node) as $mutatedNode) {
            $this->mutations[] = new SimpleMutation(
                $this->fileAst,
                $this->originalFileTokens,
                $this->originalFileContent,
                $this->mutator,
                MutatedNode::wrap($mutatedNode),
                $node->getAttributes(),
                $node::class,
            );
        }

        return null;
    }

    /**
     * @return SimpleMutation[]
     */
    public function getMutations(): array
    {
        return $this->mutations;
    }
}
